<template>
  <div class="star" :class="starType">
    <span v-for="itemClass in itemClasses" :class="itemClass" class="star-item" track-by="$index"></span>
  </div>
</template>

<script type="text/ecmascript-6">
  const LENGTH = 5;
  const CLS_ON = 'on';
  const CLS_HALF = 'half';
  const CLS_OFF = 'off';
  export default {
    props: {
      size: {type: Number},
      score: {type: Number}
    },
    computed: {
      starType () {
        return `star-${this.size}`;
      },
      itemClasses () {
        let result = [];
        let score = Math.floor(this.score * 2) / 2;
        let hasDecimal = score % 1 !== 0;
        let integer = Math.floor(score);
        for (let i = 0; i < integer; i++) {
          result.push(CLS_ON);
        }
        if (hasDecimal) {
          result.push(CLS_HALF);
        }
        while (result.length < LENGTH) {
          result.push(CLS_OFF);
        }
        return result;
      }
    }
  };
</script>

<style type="text/stylus" lang="stylus">
  @import "../../common/stylus/mixin.styl";
  div.star
    font-size: 0;
    & > span.star-item
      display: inline-block;
      background-repeat: no-repeat;
    &.star-48
      & > span.star-item
        width: 20px;
        height: 20px;
        margin-right: 22px;
        background-size: 20px 20px;
        &:last-child
          margin-right: 0;
        &.on
          bg-image('star48_on');
        &.half
          bg-image('star48_half');
        &.off
          bg-image('star48_off');
    &.star-36
      & > span.star-item
        width: 15px;
        height: 15px;
        margin-right: 6px;
        background-size: 15px 15px;
        &:last-child
          margin-right: 0;
        &.on
          bg-image('star36_on');
        &.half
          bg-image('star36_half');
        &.off
          bg-image('star36_off');
    &.star-24
      & > span.star-item
        width: 10px;
        height: 10px;
        margin-right: 3px;
        background-size: 10px 10px;
        &:last-child
          margin-right: 0;
        &.on
          bg-image('star24_on');
        &.half
          bg-image('star24_half');
        &.off
          bg-image('star24_off');
</style>
